In his first-ever interview, the sole Australian survivor of the Waco siege has revealed to 60 Minutes what really took place during the 51-day stand-off, and why he believes crazed cult leader David Koresh will one day return to Earth as the son of God.

Barnett uses speech to emphasise integrity

West Australian Premier Colin Barnett has used his speech at the Liberal state conference to emphasise his integrity as a leader and urge the party to back him going into next year's election.

Mr Barnett told the party faithful his eight-year government had capitalised on the mining boom and had delivered on health and education - areas that were traditionally seen as Labor specialties.

He conceded the state's finances was an "Achilles heel", but reiterated his argument that the GST revenue carve-up formula was to blame.

The premier said WA's economy would improve after the prime minister put in place a floor for how low a state's share of the GST could fall.

Speculation has been bandied around for several months about the future of Mr Barnett's leadership, but the premier has continued to dismiss any claims of tension among his colleagues heading into the March poll.

Far from sounding like a man ready to hand over leadership of the party any time soon, Mr Barnett said he had a job to finish and he had the team to do it.

He also described deputy leader Liza Harvey as his "ideal running mate".